Issue #15287 has been updated by Eregon (Benoit Daloze).


Eregon (Benoit Daloze) wrote:
> I wonder, what purpose do you envision for `instruction_sequence`?
> It is of course MRI-specific (as documented), so I'm not sure how one would use it on other Ruby implementations.

Actually, I think it is suboptimal to have MRI-specific methods returning MRI-specific types (RubyVM::...) in a portable class like TracePoint.
It means TracePoint cannot be supported completely on other Ruby implementations, because e.g., some method like TracePoint#instruction_sequence is MRI specific.

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Feature #15287: New TracePoint events to support loading features
https://bugs.ruby-lang.org/issues/15287#change-76702

* Author: ko1 (Koichi Sasada)
* Status: Closed
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* Target version: 2.6
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# Abstract

I propose the following new TracePoint events:

* `loaded` (invoked after `require`/`load`)
* `method_added` (invoked after method definition)

# Background

Sometimes we need to hook loading iseq. For example, checking loading files and so on.
Also we want to know what kind of methods are defined.

For both purpose, we can use some hook methods such as `Module#method_added` and so on.
However, defining methods we can override this features.
So that if we have two tools/libraries using this feature, they can be conflicted.

# Proposal

Introduce new TracePoint events:

* `loaded` (invoked after `require`/`load`)
* `method_added` (invoked after method definition)

Also the following methods can be added:

* Active only `loaded` event:
  * `TracePoint#loaded_feature` returns feature name.
  * `TracePoint#loaded_iseq` returns `RubyVM::InstructionSequence` object (MRI only, internal feature)

# Optional proposal

Add `class_added` alias name for `class` event.




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